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Pick up where you left off

This is the only page you need to bookmark. Start with Today: one short session that brings back what you've learned, then your next lesson. Progress, XP and streaks are saved in this browser automatically.
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Today · about 10 minutes

Your daily session

A warm-up that brings back the lessons you've finished, then your next new lesson. No deciding what to study.

Start → 🎮
Course 1 · learn iOS for real

iOS Academy

9 units, 51 bite-size lessons — one idea per lesson, predict-the-output puzzles, interactive diagrams, hands-on labs, quizzes, and a boss round after every unit. Now includes The AI-Native Engineer unit.

Start learning → 🧠
Quick reference · first-principles learning

Swift Fundamentals cheatsheet

Break down types, optionals, memory, Codable, collections, errors, generics, SwiftUI state, and debugging into interview-ready mental models.

Open cheatsheet → 🧩
Course 2 · zero to FAANG-ready algorithms

DSA Academy

10 units, 40 lessons teaching the patterns behind every coding interview — in Swift, with drills that train you to name the pattern from the problem alone. Covers all 18 NeetCode-150 categories.

Start solving → 🗄
Course 3 · backend & databases for full-stack interviews

Backend Academy

8 units, 31 lessons on the why behind backend decisions: SQL vs NoSQL, scaling, latency, caching, queues, APIs, rate limits, security and ops. Each lesson names its limits and applies the decision to a fictional case study. A weekend's worth.

Start learning → 🎤
Behavioural prep · say it out loud

Story Bank

The 28 behavioural questions you're most likely to get — why each is asked, what it tests and what a strong answer has — plus a drill that makes you say your answers out loud. Import your private story pack to add your own stories and model answers; it stays on your device.

Start prepping → 🪨
Optional extra · interview flashcards

Hone — interview flashcards

Open interview questions from the knowledge base on a spaced schedule, rated by you. A bonus after Today's session; the session itself already reviews every lesson you finish.

Open flashcards →

Deep-dive reading (when a course topic hooks you)

🎓 Guide

iOS Interview Prep Guide

Every topic, how it's assessed IC2 → Lead, animated explainers, a 4-week plan.
🚀 Guide

SWE Interview Prep Guide

The generalist path from near-zero DSA: company loops, interactive explainers, a 6-month plan.
🧱 Guide

Senior iOS Overlay

A 24-week senior track: real weekly tasks, region-specific interview tracks, case studies.
🎙Interviewer mode — run a rubric-scored interview for one of 7 roles (iOS & cross-platform, IC2 → Principal)▸

iOS track

iOS · IC2

iOS Software Engineer

Fundamentals depth, owns a screen end-to-end, learning architecture trade-offs.
iOS · IC3

Senior iOS Software Engineer

Owns features, picks architecture, mentors junior peers, drives quality.
iOS · IC4 / Lead

Lead iOS Software Engineer

Drives architecture across a team, hires, runs incident reviews, aligns cross-team.
iOS · IC5+

Principal iOS Software Engineer

Org-wide platform strategy, multi-year bets, ambiguous problem definition.

Cross-platform mobile track

Mobile · IC2

Mobile Developer

Comfortable on one platform deeply, exposure to a second, owns mobile features.
Mobile · IC3

Senior Mobile Developer

Picks the right tech per platform, KMM/shared-logic trade-offs, mentors peers.
Mobile · IC5+

Principal Mobile Developer

Sets the mobile platform direction, owns cross-platform strategy, influences org-wide.